Yamaha's DEQ equivalent seems to be YPAO volume:
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YPAO™ Volume Ensures Quality Audio at All Volumes - Yamaha Music
Yamaha YPAO™ Volume allows you to hear balanced low, mid and high frequencies clearly, even at low volumes. This article explains how it works.hub.yamaha.com
Thanks; so my recollection from 6+ months ago was wrong. The question is, could this "YPAO Volume" on the A6A be enabled even in the mode where YPAO-measured FR corrections were not applied for the front L/Rs? Probably yes, because unlike in the 3800H's "L/R Bypass" mode, YPAO supports a "YPAO:Front" mode which "adjusts each speaker to achieve the same characteristics as the front speakers." That implies that YPAO would leave the front L/R FR intact, adjust all other speakers to sound like them, and still allow YPAO Volume on the fronts L/R.